/*
 *    Copyright 2009-2012 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.apache.ibatis.reflection;

import org.apache.ibatis.reflection.factory.ObjectFactory;
import org.apache.ibatis.reflection.property.PropertyTokenizer;
import org.apache.ibatis.reflection.wrapper.*;

import java.util.Collection;
import java.util.List;
import java.util.Map;

/**
 * @author Clinton Begin
 */
public class MetaObject {

    private Object originalObject;
    private ObjectWrapper objectWrapper;
    private ObjectFactory objectFactory;
    private ObjectWrapperFactory objectWrapperFactory;

    private MetaObject(
            Object object,
            ObjectFactory objectFactory,
            ObjectWrapperFactory objectWrapperFactory) {
        this.originalObject = object;
        this.objectFactory = objectFactory;
        this.objectWrapperFactory = objectWrapperFactory;

        if (object instanceof ObjectWrapper) {
            this.objectWrapper = (ObjectWrapper) object;
        } else if (objectWrapperFactory
                .hasWrapperFor(object)) {
            this.objectWrapper = objectWrapperFactory
                    .getWrapperFor(
                            this,
                            object);
        } else if (object instanceof Map) {
            this.objectWrapper = new MapWrapper(
                    this, (Map) object);
        } else if (object instanceof Collection) {
            this.objectWrapper = new CollectionWrapper(
                    this,
                    (Collection) object);
        } else {
            this.objectWrapper = new BeanWrapper(
                    this, object);
        }
    }

    public static MetaObject forObject(
            Object object,
            ObjectFactory objectFactory,
            ObjectWrapperFactory objectWrapperFactory) {
        if (object == null) {
            return SystemMetaObject.NULL_META_OBJECT;
        } else {
            return new MetaObject(
                    object,
                    objectFactory,
                    objectWrapperFactory);
        }
    }

    public ObjectFactory getObjectFactory() {
        return objectFactory;
    }

    public ObjectWrapperFactory getObjectWrapperFactory() {
        return objectWrapperFactory;
    }

    public Object getOriginalObject() {
        return originalObject;
    }

    public String findProperty(
            String propName,
            boolean useCamelCaseMapping) {
        return objectWrapper
                .findProperty(propName,
                        useCamelCaseMapping);
    }

    public String[] getGetterNames() {
        return objectWrapper
                .getGetterNames();
    }

    public String[] getSetterNames() {
        return objectWrapper
                .getSetterNames();
    }

    public Class<?> getSetterType(
            String name) {
        return objectWrapper
                .getSetterType(name);
    }

    public Class<?> getGetterType(
            String name) {
        return objectWrapper
                .getGetterType(name);
    }

    public boolean hasSetter(String name) {
        return objectWrapper
                .hasSetter(name);
    }

    public boolean hasGetter(String name) {
        return objectWrapper
                .hasGetter(name);
    }

    public Object getValue(String name) {
        PropertyTokenizer prop = new PropertyTokenizer(
                name);
        if (prop.hasNext()) {
            MetaObject metaValue = metaObjectForProperty(prop
                    .getIndexedName());
            if (metaValue == SystemMetaObject.NULL_META_OBJECT) {
                return null;
            } else {
                return metaValue
                        .getValue(prop
                                .getChildren());
            }
        } else {
            return objectWrapper
                    .get(prop);
        }
    }

    public void setValue(String name,
                         Object value) {
        PropertyTokenizer prop = new PropertyTokenizer(
                name);
        if (prop.hasNext()) {
            MetaObject metaValue = metaObjectForProperty(prop
                    .getIndexedName());
            if (metaValue == SystemMetaObject.NULL_META_OBJECT) {
                if (value == null
                        && prop.getChildren() != null) {
                    return; // don't instantiate child path if value is null
                } else {
                    metaValue = objectWrapper
                            .instantiatePropertyValue(
                                    name,
                                    prop,
                                    objectFactory);
                }
            }
            metaValue.setValue(
                    prop.getChildren(),
                    value);
        } else {
            objectWrapper.set(prop,
                    value);
        }
    }

    public MetaObject metaObjectForProperty(
            String name) {
        Object value = getValue(name);
        return MetaObject.forObject(
                value, objectFactory,
                objectWrapperFactory);
    }

    public ObjectWrapper getObjectWrapper() {
        return objectWrapper;
    }

    public boolean isCollection() {
        return objectWrapper
                .isCollection();
    }

    public void add(Object element) {
        objectWrapper.add(element);
    }

    public <E> void addAll(List<E> list) {
        objectWrapper.addAll(list);
    }

}
